BreatherLeiYu opened a new issue #10380: 使用dataset时 饼图formatter: "{a} <br/>{b}
: {c} ({d}%)"}异常显示{c}为[object Object]
URL: https://github.com/apache/incubator-echarts/issues/10380
### Version
4.2.1
### Reproduction link
[https://gallery.echartsjs.com/editor.html?c=xy0Z8U-Roj&v=1](https://gallery.echartsjs.com/editor.html?c=xy0Z8U-Roj&v=1)
### Steps to reproduce
option ={"tooltip":{"trigger":"item",formatter: "{a} <br/>{b} : {c}
({d}%)"},"legend":{},"series":[{"type":"pie"}],"dataset":{"dimensions":["df4","eff"],"source":[{"eff":0,"df4":"2018-10-12"},{"eff":0,"df4":"2018-10-15"},{"eff":0,"df4":"2018-10-16"},{"eff":0,"df4":"2018-10-17"},{"eff":0,"df4":"2018-10-18"},{"eff":0,"df4":"2018-10-19"},{"eff":0,"df4":"2018-10-22"},{"eff":0,"df4":"2018-10-23"},{"eff":0,"df4":"2018-10-24"},{"eff":0,"df4":"2018-10-25"}]}}
;
### What is expected?
{c}为具体值
### What is actually happening?
{c}为[object Object]
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